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<TITLE>Hide Layers on HTML legend where filtered results are null</TITLE>
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<DIV><FONT color=#0000ff size=2><SPAN class=161091021-14112002>Thanks to Dan
& Peter for their prompt replies. Works like a charm if I "hard-code"
those values in my map file.</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff size=2><SPAN
class=161091021-14112002></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff size=2><SPAN class=161091021-14112002>Currently, I have
all the layers in my mapfile set with...</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff size=2><SPAN
class=161091021-14112002></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff size=2><SPAN
class=161091021-14112002>METADATA</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff size=2><SPAN
class=161091021-14112002> "legend_order" "0"</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff size=2><SPAN
class=161091021-14112002>End</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff size=2><SPAN
class=161091021-14112002></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff size=2><SPAN class=161091021-14112002>I know before I
initialize the map if there won't be any results to display as a result of
my filter</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff size=2><SPAN
class=161091021-14112002></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff size=2><SPAN class=161091021-14112002>If I try and pass
the values to my map template as part of my GET string (e.g.,
map_mylayername_metadata_legend_order=-1) it seems to ignore it - shouldn't this
method work?</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff size=2><SPAN
class=161091021-14112002></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff size=2><SPAN
class=161091021-14112002>Thanks</SPAN></FONT></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Martin, Daniel
[mailto:DMartin@erac.com]<BR><B>Sent:</B> Thursday, November 14, 2002 12:37
PM<BR><B>To:</B> Palmer, Steve;
mapserver-users@lists.gis.umn.edu<BR><B>Subject:</B> RE: [mapserver-users]
Hide Layers on HTML legend where filtered r esults are
null<BR><BR></FONT></DIV>
<DIV><SPAN class=924492619-14112002><FONT face=Arial color=#0000ff
size=2>Steve,</FONT></SPAN></DIV>
<DIV><SPAN class=924492619-14112002><FONT face=Arial color=#0000ff
size=2>Without Mapscript, I suspect that's going to be hard to do. The
two ways I know of to hide a layer in the legend is:</FONT></SPAN></DIV>
<DIV><SPAN class=924492619-14112002><FONT face=Arial color=#0000ff size=2>1)
Setting the status to off -> requires not using an opt_flag of
2.</FONT></SPAN></DIV>
<DIV><SPAN class=924492619-14112002><FONT face=Arial color=#0000ff size=2>2)
Using the order_metadata feature, and setting the metadata value to a negative
number. In this case the status is irrelevant.</FONT></SPAN></DIV>
<DIV><SPAN class=924492619-14112002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=924492619-14112002><FONT face=Arial color=#0000ff
size=2>I'm don't think you can do either as the result of a filter
without Mapscript. Perhaps someone else knows a
way....</FONT></SPAN></DIV>
<DIV><SPAN class=924492619-14112002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=924492619-14112002><FONT face=Arial color=#0000ff
size=2>-Dan</FONT></SPAN></DIV>
<DIV><SPAN class=924492619-14112002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Palmer, Steve
[mailto:Steve_Palmer@lpsg.com]<BR><B>Sent:</B> Thursday, November 14, 2002
11:27 AM<BR><B>To:</B> mapserver-users@lists.gis.umn.edu<BR><B>Subject:</B>
[mapserver-users] Hide Layers on HTML legend where filtered results are
null<BR><BR></FONT></DIV>
<P><FONT face=Arial size=2>I've waded through hundreds and hundreds of
archived messages and have not found any guidance and am hoping someone can
point me in the right direction.</FONT></P>
<P><FONT face=Arial size=2>I am displaying layers on an HTML legend</FONT>
</P>
<P><FONT face=Arial size=2>The content of those layers is controlled by
passing a filter value as part of my GET string
(map_mylayername_filter=somevalue)</FONT></P>
<P><FONT face=Arial size=2>If the filter doesn't "find" any records, I would
like to be able to hide that layer on my legend</FONT> </P>
<P><FONT face=Arial size=2>Any tips/guidance that anyone could provide would
be greatly appreciated</FONT> </P>
<P><FONT face=Arial size=2>MapServer 3.6.1, WinNT/IIS4 - Win2000/IIS5</FONT>
</P>
<P><FONT face=Arial size=2>Thanks</FONT> </P>
<P><FONT face=Arial
size=2>*************************************************************************************************************</FONT>
<BR><FONT face=Arial size=2>Steve Palmer</FONT> <BR><FONT face=Arial
size=2>GIS Developer</FONT> <BR><FONT face=Arial size=2>406-728-9323
x206<B></B></FONT> </P></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>